Table 3.

Reconfiguration of classification criteria for cancer of the lung.

Classification	Definition	Yes/No question
T3: Complex definition	Tumor more than 7 cm or one that directly invades any of the following: parietal pleural (PL3) chest wall (including superior sulcus tumors), diaphragm, phrenic nerve, mediastinal pleura, parietal pericardium; or tumor in the main bronchus less than 2 cm distal to the carina but without involvement of the carina; or associated atelectasis or obstructive pneumonitis of the entire lung or separate tumor nodule(s) in the same lobe	Is the primary tumor >7 cm in greatest dimension? OR Does it invade any of these structures: Parietal pleura; Chest wall (including the superior sulcus); Diaphragm; Phrenic nerve; Mediastinal pleura; Parietal pericardium OR Does it involve the main bronchus at a site that is >2 cm distal to the carina without involvement of the carina? OR Is it associated with atelectasis or obstructive pneumonitis of the entire lung? OR Is there a separate tumor nodule in the same lobe?
T2: Combined Boolean AND + OR conditions	Tumor more than 3 cm but 7 cm or less or tumor with any of the following features (T2 tumors with these features are classified T2a if 5 cm or less): involves main bronchus, 2 cm or more distal to the carina; invades visceral pleura (PL1 or PL2); associated with atelectasis or obstructive pneumonitis that extends to the hilar region but does not involve the entire lung	Is the primary tumor >3 cm and ≤7 cm in greatest dimension? OR Is it associated with any of these findings:
		Involvement of the main bronchus at a site that is ≥2 cm distal to the carina; Invasion of the visceral pleura; Atelectasis or obstructive pneumonitis that extends to the hilar region but does not involve the entire lung
M0: Negative definition	No distant metastasis	Is there evidence of distant metastasis?